PostHog support (#313)

.env.example

@@ -80,6 +80,10 @@ OIDC_REDIRECT_URI=
 PRODUCT_NAME=
 BRAND_NAME=
 
+# PostHog configuration
+POSTHOG_KEY=
+POSTHOG_HOST=
+
 # Disable enforcing SSL connections
 # DISABLE_SSL=true
 

Gemfile

@@ -40,6 +40,7 @@ gem "rack-mini-profiler"
 gem "sentry-ruby"
 gem "sentry-rails"
 gem "sentry-sidekiq"
+gem "posthog-ruby"
 gem "logtail-rails"
 gem "skylight", groups: [ :production ]
 

Gemfile.lock

@@ -425,6 +425,8 @@ GEM
     platform_agent (1.0.1)
       activesupport (>= 5.2.0)
       useragent (~> 0.16.3)
+    posthog-ruby (3.3.3)
+      concurrent-ruby (~> 1)
     pp (0.6.2)
       prettyprint
     prettyprint (0.2.0)
@@ -736,6 +738,7 @@ DEPENDENCIES
   pagy
   pg (~> 1.5)
   plaid
+  posthog-ruby
   propshaft
   puma (>= 5.0)
   rack-attack (~> 6.6)

app/views/layouts/shared/_head.html.erb

@@ -27,5 +27,9 @@
   <link rel="apple-touch-icon" href="/logo-pwa.png">
   <link rel="apple-touch-icon" sizes="512x512" href="/logo-pwa.png">
 
+  <% if Rails.env.production? && (posthog_config = Rails.configuration.x.posthog).try(:api_key).present? %>
+    <%= render "shared/posthog", posthog_api_key: posthog_config.api_key, posthog_host: posthog_config.host %>
+  <% end %>
+
   <%= yield :head %>
 </head>

app/views/shared/_posthog.html.erb

@@ -0,0 +1,9 @@
+<!-- PostHog -->
+<script nonce="<%= content_security_policy_nonce %>">
+    !function(t,e){var o,n,p,r;e.__SV||(window.posthog && window.posthog.__loaded)||(window.posthog=e,e._i=[],e.init=function(i,s,a){function g(t,e){var o=e.split(".");2==o.length&&(t=t[o[0]],e=o[1]),t[e]=function(){t.push([e].concat(Array.prototype.slice.call(arguments,0)))}}(p=t.createElement("script")).type="text/javascript",p.crossOrigin="anonymous",p.async=!0,p.src=s.api_host.replace(".i.posthog.com","-assets.i.posthog.com")+"/static/array.js",(r=t.getElementsByTagName("script")[0]).parentNode.insertBefore(p,r);var u=e;for(void 0!==a?u=e[a]=[]:a="posthog",u.people=u.people||[],u.toString=function(t){var e="posthog";return"posthog"!==a&&(e+="."+a),t||(e+=" (stub)"),e},u.people.toString=function(){return u.toString(1)+".people (stub)"},o="init Rr Mr fi Or Ar ci Tr Cr capture Mi calculateEventProperties Lr register register_once register_for_session unregister unregister_for_session Hr getFeatureFlag getFeatureFlagPayload isFeatureEnabled reloadFeatureFlags updateEarlyAccessFeatureEnrollment getEarlyAccessFeatures on onFeatureFlags onSurveysLoaded onSessionId getSurveys getActiveMatchingSurveys renderSurvey displaySurvey canRenderSurvey canRenderSurveyAsync identify setPersonProperties group resetGroups setPersonPropertiesForFlags resetPersonPropertiesForFlags setGroupPropertiesForFlags resetGroupPropertiesForFlags reset get_distinct_id getGroups get_session_id get_session_replay_url alias set_config startSessionRecording stopSessionRecording sessionRecordingStarted captureException loadToolbar get_property getSessionProperty Ur jr createPersonProfile zr kr Br opt_in_capturing opt_out_capturing has_opted_in_capturing has_opted_out_capturing get_explicit_consent_status is_capturing clear_opt_in_out_capturing Dr debug M Nr getPageViewId captureTraceFeedback captureTraceMetric $r".split(" "),n=0;n<o.length;n++)g(u,o[n]);e._i.push([i,s,a])},e.__SV=1)}(document,window.posthog||[]);
+    posthog.init('<%= posthog_api_key %>', {
+        api_host: '<%= posthog_host %>',
+        defaults: '2025-05-24',
+        person_profiles: 'identified_only', // or 'always' to create profiles for anonymous users as well
+    })
+</script>

config/initializers/content_security_policy.rb

@@ -11,6 +11,7 @@
 #     policy.img_src     :self, :https, :data
 #     policy.object_src  :none
 #     policy.script_src  :self, :https
+#     policy.script_src  :self, :https, 'https://us.i.posthog.com'
 #     policy.style_src   :self, :https
 #     # Specify URI for violation reports
 #     # policy.report_uri "/csp-violation-report-endpoint"

config/initializers/posthog.rb

@@ -0,0 +1,14 @@
+require "posthog"
+
+Rails.configuration.x.posthog = ActiveSupport::OrderedOptions.new
+Rails.configuration.x.posthog.api_key = ENV["POSTHOG_KEY"].presence
+Rails.configuration.x.posthog.host = ENV.fetch("POSTHOG_HOST", "https://us.i.posthog.com")
+
+if (api_key = Rails.configuration.x.posthog.api_key).present?
+  # Initialize PostHog client
+  $posthog = PostHog::Client.new({
+    api_key: api_key,
+    host: Rails.configuration.x.posthog.host,
+    on_error: Proc.new { |status, msg| puts "PostHog error: #{status} - #{msg}" }
+  })
+end